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On the image of TR813 I posted in Page 1 you have the Base on the left (Red), Collector in the middle (Orange, with sleeve) and Emitter on the right (Green). The EHT schematic to save switching to pdf all the time. I will have to get some 500mA fuses as I used the only one I could find yesterday. The fuses I can find locally are quick blow 500mA. We do have some 630mA and some 800mA here at work. C814 was the first place I checked in the EHT when I thought I had a short, the 2.2kOhm I had across it made me realise my mistake.

Click to expand. Any of the secondary side rectifiers could be S/C, there's also the lesser possibility of a rectifier becoming very leaky at working voltage - but not showing on a DMM resistance check.

Jun 24, 2012  Oscilloscope C1 94 marekmagda1. Unsubscribe from marekmagda1? Licensed to YouTube by INgrooves (on behalf of Sorted Noise Records); ASCAP, Audiam (Publishing), UBEM, and 18 Music. Download C1-73 OSCILLOSCOPE service manual & repair info for electronics experts. Service manuals, schematics, eproms for electrical technicians. This site helps you to save the Earth from electronic waste! C1-73 OSCILLOSCOPE. Type: (RAR) Size 2.0 MB. Page---Category METER SERVICE MANUAL.

Capacitors in those sort of voltage ratings can break down at full voltage but not show on the DMM, ceramic caps can crack and arc - there's usually some fizzing and maybe a whisp of smoke. The wound metallised foil caps tend more to fail S/C and stay that way, sometimes they develop a bulge if there's enough power from the inverter. I think I may have found it.

TR814 is showing a short across the C-E junction. TR815, D813, D814, R819 and R820 all seem fine. BFY50 is the component. Usb controller drivers for windows 7. Will that be the fault do you guys think, or will this have blown because of something upstream.

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Anyway I will see if they can still be obtained and if so get a few of them on order and see if it works when replaced. I may have one or two in my parts bin actually. I seem to recall buying a component with a similar part number, that was NPN but it may have been the 51 or 52 version. Confirmed I have two BFY51. I seem to remember part numbers really well for some reason an can remember almost every component I've bought. Now to check the data sheet for the differences.

Yes I know there may be something upstream still faulty but Mrs Teal'c has put her foot down and kicked me off the kitchen table for the time being. Another issue is that the upstream bit is the nasty high voltage stuff and I'm nervous of it. The high voltage stuff is covered in wax-like material so I will have to scrape all that off before I can lift components. If I do get rid of it I will insulate it with something else.

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Of interest though is this. I found it rattling about inside the scope. I wonder if it is this that caused the problem by shorting something out. I used to keep it in a hole at the back of the scope for safe keeping.

At some point the top section of it must have been sheared off or something and down it went inside. I had wondered where the thing had gone to. I used it for turning small 20 turn potentiometers and I lost it after moving house in October. I moved the scope on the day of failure so I have to wonder if it was the cause, although it did work for a while after moving it.

Click to expand. Another fault is possible, you could try temporarily replacing the fuse with a power resistor to limit the current - some people use a suitably rated bulb for this, but you have to bear in mind the PTC filament - starting from cold it has a very low resistance and for a split second doesn't limit the current much. It wouldn't hurt to check the secondary side rectifiers for leakage before powering up - if the inverter gets going with the current limited, you could be good to go with a replacement fuse.

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